| 主题: 介绍Philips特殊的RF模拟器件和标准逻辑器件 |
| 在线问答: |
| [主持人：ChinaECNet] |
各位听众（网友），上午好！欢迎参加中电网在线座谈。今天，我们有幸邀请到Philips公司的专家就“介绍Philips特殊的RF模拟器件和标准逻辑器件”举行在线座谈。在座谈中，您可就您关心的问题与Philips公司的专家在线进行直接、实时的对话交流。中电网衷心希望通过大家的共同努力，不仅能够增进各位听众（网友）对“介绍Philips特殊的RF模拟器件和标准逻辑器件”的了解和掌握，而且能够为大家事业的发展带来裨益。 |
[2006-5-30 10:25:43] |
| [主持人：ChinaECNet] |
我们已经进入问答阶段如果听众想重温演讲或内容可以点击下面“回顾演示”重看演讲。 |
[2006-5-30 10:28:21] |
| [问：yhs] |
我想用现在市场能够买到的"d类功率放大器"够成;单电源 48V,300W,9--36欧.或者,70v定压输出.的功率放大器.是否能实现? |
| [答：Aika] |
No. In this session we just have 3-5W Class D in our team. Maybe other
team have this kind of products. |
[2006-5-30 10:29:55] |
| [问：malzone] |
小体积封装的散热性能怎样？有无满负荷时的温升曲线？ |
| [答：Aika] |
The heat should not be the problem. The heat will pass to the PCB quickly. |
[2006-5-30 10:30:47] |
| [问：chenerbox] |
MicroPak封装是一种很不错的封装,Philips公司那些产品是采用MicroPak封装?价格上涨多少? |
| [答：Aika] |
Mainly in Picogates - 1G/2G/3G. Our suffix is GM or GT. The pricing
is around 2 times than normal package, like GW-SOT353. |
[2006-5-30 10:36:29] |
| [主持人：ChinaECNet] |
在此回答问题的专家是Philips公司的：Aika Tsai、Richard Yu、Alex Zou、Jan
Olander、Harry Swanson、Mark Gao、Cliff Lloyd、
Patrick Loh、Kris Keuser和David Wong。 |
[2006-5-30 10:36:41] |
| [问：huimin.zhang] |
请主持人讲一下：Philips比竞争对手的优势。TI, ST,NS, ONSEMI... |
| [答：Aika] |
The pricing is competitive, compared with other competitors. The product
portfolio is board as well. And we have good support in China also. So
pls consider to use our logic products. |
[2006-5-30 10:38:01] |
| [问：ldrag] |
请问处理器的PWM脉冲输出可以接D类直接放大器吗？ |
| [答：Harry] |
If you are referring to the audio PCM data stream (i.e. digital audio),
the answer is NO. The Class D audio amplifiers that Specialty Analog are
for analog ausio input only.
Other group at Philips are developing Class D amplifiers for digital audio
input. They should be out in 2007. |
[2006-5-30 10:41:19] |
| [问：evan_yin] |
我司现使用Philips的AM、FM接收芯片TDA2543
(DIP-18)和降噪芯片TDA1001(DIP-16)，因以上芯片都已经停产，所以我司想咨询这两款芯片的替代芯片，谢谢！ |
| [答：Alex] |
TDA2543， TDA1001芯片都不属于该产品线产品，请向飞利浦其它相关产品部门咨询 |
[2006-5-30 10:42:24] |
| [问：johndong] |
我以前从事TUNER的设计，对PHILIPS的RF还是比较熟悉的，特别是解调电路！现在贵公司推出那些这个方面IC？ |
| [答：Alex] |
飞利浦FM IF系统芯片均包含解调模块，如SA604, SA605, SA614, SA636等，你可以查看相关资料以选择合适的芯片 |
[2006-5-30 10:44:38] |
| [问：chenerbox] |
Ultra-low Power器件在工艺上如何达到?有那些特别的技术?设计上有独到之处吗? |
| [答：Aika] |
It is all about new IC design and new advanced process applied for AUP
family. So this product have better signal detect and consumer less power
and could work @ 2.5V or 1.8V. |
[2006-5-30 10:45:05] |
| [问：gumption] |
贵公司有没有视频信号模拟切换开关（switch or mux）可以推荐。
同时请问，在设计处理这种模拟视频信号时，PCB上应格外注意什么？ |
| [答：Alex] |
对不起，今天介绍的产品中不包含此类视频模拟开关，你可以向电视部门咨询此类产品 |
[2006-5-30 10:46:25] |
| [问：wuxilake] |
和其它封装如QFN相比,DQFN封装的主要特点是什么?D代表什么意义? |
| [答：Aika] |
DQFN stands for De-populated Quad Flatpak No leads. QFN is similar to
DQFN but the dimension is different. |
[2006-5-30 10:47:45] |
| [问：chenerbox] |
同样的芯片,DQFN和MicroPak封装在价格上差多少? |
| [答：Aika] |
DQFN is for >14 pin IC and MicroPak is for <8 pin IC. They are
different. For pricing, DQFN is competitive with TSSOP package; MicroPak
is around 0.1 usd/pcs. |
[2006-5-30 10:49:30] |
| [问：chen903wei] |
Philips有没有全数字化放大器?在音质和音色上, 全数字化放大器和传统的模拟放大器有何不同的差别? |
| [答：Alex] |
本产品线暂时没有全数字化放大器 |
[2006-5-30 10:51:31] |
| [问：totty_zhu] |
请问PHILIPS的WIFI RF module在整个通带内的功率校准波动范围能够控制在多少范围内？ |
| [答：Alex] |
WIFI产品不属于本产品线，请向飞利浦半导体通讯部门咨询WIFI相关器件，谢谢 |
[2006-5-30 10:52:34] |
| [问：simon72] |
该功率放大器是否有噪音抑制功能？ |
| [答：Alex] |
是的，今天展示的音频功放均具有噪音抑制功能 |
[2006-5-30 10:54:15] |
| [问：johndong] |
philips在上海的技术支持怎么去联系？我想知道！ |
| [答：Alex] |
请联系 alex.zou@philips.com
Tel: 22055693 |
[2006-5-30 10:56:47] |
| [问：johndong] |
PHILIPS的音频D/A转化有无静音功能，如果有能否做到静音时，音频模拟输出很小，无杂波？ |
| [答：Alex] |
你指的是单独的音频D/A器件吗？本产品线暂时没有此类产品 |
[2006-5-30 10:58:14] |
| [主持人：ChinaECNet] |
各位观众，现在用户提问很踊跃，专家正在逐一回答。请耐心等待您问题的答案，同一问题请不要多次提交。 |
[2006-5-30 10:58:48] |
| [问：zubin] |
模拟出来的驻波比达150到200,是什么原因?
怎么计算非空气物质中的电磁波长?
四分之一波长和传输接头有什么关系? |
| [答：Harry] |
A simulated voltage standing wave ratio of 200 is approximately 46 dB.
This is a very good number and probably represents an ideal situation.
if you are measuring less than this, it is probably due to real world
conditions susch as parasitics, termination impedances that are not taken
into consideration in the simulation model.
A wavelength is equal to C/f in air but it is altered by the dielectric
constant of the propagation medium. Divide by ssuare root of the deielectric
constant.
A quarter wavelength transmission line will transform the impedance by
a factor of 4. Example: A 50 ohm input (source) is transformed to a 12.5
ohm load, for a 1/4 wavelength transmission line of 25 ohms. The characteristic
impedance of the transmission line is clacukated as the square root of
the source x load impedances. |
[2006-5-30 10:59:41] |
| [问：buoldshi] |
Philips有没有无线数字家庭影院解决方案?它和传统的有线家庭影院相比,有何优势? |
| [答：Aika] |
We do not have this kind of products in our team. We will pass this
to other team. |
[2006-5-30 11:03:34] |
| [问：kkwd] |
此模块是否可以应用在MP3上面？ |
| [答：Mark] |
what module? |
[2006-5-30 11:04:13] |
| [问：ldrag] |
请专家详细介绍AB类/D类 BTL音频放大器及双路和四路轨到轨运算放大器的情况，谢谢！！！ |
| [答：Alex] |
我们现有SA58631/2 AB类单/双声道 音频放大器，下个月会退出两款D类 单/双声道 音频放大器，均为BTL输出，双路和四路轨到轨运放我们有NE/SA
5232/5234系列，可以去我们的网站查看相关产品信息 |
[2006-5-30 11:06:38] |
| [问：totty_zhu] |
现在是否有推出WIFI与GSM双模工作的RF芯片模块 |
| [答：Alex] |
此列产品请向飞利浦半导体通讯部门查询，谢谢 |
[2006-5-30 11:07:08] |
| [问：buoldshi] |
900MHz 模拟收发器能用在什么领域?能举几个应用例子吗? |
| [答：Alex] |
无绳电话，对讲机，无线数字通讯，如远程抄表等 |
[2006-5-30 11:08:47] |
| [问：lizhengheng] |
Philips的标准逻辑器件有那些种类?是否是全系列的? |
| [答：Aika] |
We have several families in Standard Logic, covering 400+ functions
and 5+ packages. Our portfolio is boarder than other competitors. |
[2006-5-30 11:09:07] |
| [问：totty_zhu] |
在手机的speaker输出时，当输出音量设置过大时回出现破音或失真，请问为何会出现此问题和如何避免该问题？ |
| [答：Alex] |
音频功放的失真度只在一定输出功率下保证，并且会随着输出功率提高而增大，可以选择更大功率的功放 |
[2006-5-30 11:10:49] |
| [问：zyb6252] |
philips产品在安徽有技术支持和销售吗？ |
| [答：Alex] |
对不起，我们在安徽没有办事处，不过我们的代理商和上海公司均会为安徽客户提供支持 |
[2006-5-30 11:11:38] |
| [问：cyzsy] |
请问：
是否有跨墙传输距离大于100米，低功耗的无线传输模块？
章圣意
zsy@zjcnyb.com |
| [答：Alex] |
如果你说模块当然可以做到，比如我们今天介绍的SA58646加上合适的功率放大器可以做到，但不清楚你说的低功耗是要求多少 |
[2006-5-30 11:14:59] |
| [问：longingsky] |
Philips的标准逻辑器件和TI等公司相比,有何特色? |
| [答：Aika] |
Pricing + support + focus are our advantage for logic. As well, we offer
lots of families and functions and packages to fit all possible requirements
from customers. |
[2006-5-30 11:18:06] |
| [问：dgclmx] |
For the high power Class-D solution, Would
you give some advice with Philips products? |
| [答：Aika] |
Our team focus on low power Class D solution. You need you contact the
other team about the high power CLass-D ones. Sorry. |
[2006-5-30 11:19:28] |
| [问：johndong] |
对于RF放大电路，如果供电不足，会RF输出产生谐波分量？ |
| [答：Harry] |
Yes. This is possible. The harmonic distortion performance depends on
the bias scheme used, such as Class A, Class AB or Class C. The Class
A bias is most linear and will provide the best performance with input
drive level but it has the worse efficiency. The power output depends
on the size of the device and the bias current. A specific device is optimize
for output power versus bias current.
Class AB will utilizes a small quiescent bias current and will provide
an output based on input drive level. Class AB amplifiers have best efficiency
with maximum power output. However if they are driven to hard, the output
wave form will began to clip and the distortion will increase. In other
words, the harmonic components increase. The output power level depends
on the size of the device.
The class C amplifier is not bias but it works from the input drive to
the part. A key future of a class C amplifier is to have a large BVebo
voltage, which allows for the device to handle large input signals. The
Class C amp has the best efficieny of the three and will exhibit harmonic
distortion in the same way as the class AB amp.
The dynamic operating range of the input drive is best for class A and
will decrease from class AB to class C. When the class AB and Class C
amps are turning on with input drive level there is a tendency for high
harmonics to exist. |
[2006-5-30 11:19:40] |
| [问：lam007] |
philips公司的RF器件,怎么没有ADS,DESIGNER的仿真软件的模型呢? |
| [答：Alex] |
是的，其实你应该会发现，现在新的RF器件很少提供此类模型 |
[2006-5-30 11:28:02] |
| [问：zjjsmail] |
在RFIC 的接受端加Balun是为了抗干扰，但是在输出端加Balun有什么用？ |
| [答：Harry] |
A BALUN is used to do many things:
1) They transfer from a single ended input to a differential drive; Also,
they may be used to transfer from a differential output to to single ended
load.
2) Thet can be used to differential amplifier cascade stages to together
(output to input).
3) They may be used as impedance transformers (1:4, 1:9, and so forth)
If a device has differential inputs and/or outputs a BALUN helps to cancel
the noise as well as, increase the signal level transmitted.
Thank you. Hope this is sufficient information. |
[2006-5-30 11:28:20] |
| [问：shenwenbin0] |
Philips的那些产品具有3D环绕声功能?请举例说明,并告知价格.谢谢! |
| [答：Alex] |
本产品线只提供小功率音频功放芯片，你可能需要向飞利浦其它部门查询 |
[2006-5-30 11:29:20] |
| [问：shenwenbin0] |
请介绍Philips在家庭音响系统的产品,包括模拟和数字放大器.谢谢! |
| [答：Alex] |
请向飞利浦半导体家庭和电视部门查询此类产品 |
[2006-5-30 11:29:53] |
| [问：simon72] |
我正在做有线的楼宇对讲系统，想采用该放大器，你们是否能提供使用你们放大器的设计方案，要求设计能提供详细解决各种干扰问题。谢谢！ |
| [答：Alex] |
是的，我们会推出演示板以展示产品功能，具体对设计的支持请会后联系我，我们会为客户提供尽可能好的支持 |
[2006-5-30 11:31:40] |
| [问：Fisher.zhao] |
请介绍一下NFC技术 |
| [答：Alex] |
NFC属于飞利浦半导体通讯或者识别部门的产品，请向他们查询 |
[2006-5-30 11:32:25] |
| [问：johndong] |
对于HDMI的TDA9970的TMDS输入有什么需要注意的？ |
| [答：Alex] |
HDMI属于本部门其它产品线，请联系相关人员获取支持 |
[2006-5-30 11:33:12] |
| [问：smartbits] |
SA612的工作频率范围是多少？ |
| [答：Alex] |
SA612工作频率低于500MHz |
[2006-5-30 11:34:40] |
| [问：cnsharc] |
这些产品属于飞利浦半岛体的哪个产品线或者部门？ |
| [答：Aika] |
logic and specialty analog are belonged to Standard IC group. |
[2006-5-30 11:37:06] |
| [问：tziang] |
Are there some D class AUDIO PAs used in mobile? |
| [答：Alex] |
yes, we will have SA5867x can be used in mobile soon |
[2006-5-30 11:38:20] |
| [问：shenwenbin0] |
请问如何解决无线音频传输中系统内部产生的噪声？ |
| [答：Alex] |
这是复杂的问题，涉及射频，音频甚至整个系统的设计 |
[2006-5-30 11:40:06] |
| [问：wyq_0824] |
音频放大器的干扰源有那些?如何来降低它?在设计上要应注意什么? |
| [答：Alex] |
外部环境的干扰，器件本身的失真，传输线路上的失配等，那么需要注意的就是如何在设计中减少和消除这些干扰了 -:) |
[2006-5-30 11:41:44] |
| [问：dgclmx] |
音频放大器中，电流反馈和电压反馈电路有什么区别，如何使用? |
| [答：Jan] |
Current feedback amplifier has the same closed-loop equations as the
voltage feedback amplifier but the current feedback amp offers improvements
when compared with the VFA. The CFA"s cost less per megahertz
of bandwidth and don"t have the constant gain-bandwidth or slew rate limits
of the VFA. As a result, the CFA"s opoen-loop gain doesn"t
roll off until much higher frequencies. The CFA is usually
the amplifier of choice for high-frequency op-amps. For further info ask
Harry. |
[2006-5-30 11:43:40] |
| [问：wangjunhu] |
请问如何解决无线音频传输中系统内部产生的噪声？ |
| [答：Harry] |
This question covers a lot of system design criteria.
The signal modualated on the transmitter VCO must be very linear and low
noise. If the modualated signal has distortion and noise, no matter how
good the receiver is, the receiver recovered signal will be only as good
as the modulated signal at the transmitter.
The transmiited signal must be filtered before it is presented to the
VCO. This makes sure that the modulated RF signal bandwidth is properly
limited. The VCO must have adequate phase noise and linearity. If the
phase noise and distortion is high, the recovered audio at the receiver
will be impaired. The VCO is the primary concern. The VCO must be designed
with optimal components (i.e. inductor and varactors having highest Q
available). If the system employs a PLL synthesizer; the loop filter design
of the PLL is important for proper operation of the VCO.
PCB layout, proper decoupling and utilization of differential signal paths
also play a key role in design of low noise wireless audio transmission.
Hope this helps. |
[2006-5-30 11:45:03] |
| [问：h1979587] |
D类音频放大器输出功率和额定输出功率应留有多大富余量,以提高可靠性? |
| [答：Alex] |
通常器件资料中会给出输出功率与其它一些参数的曲线，比如，与失真度的曲线，设计时可以参考这些详细的信息 |
[2006-5-30 11:45:42] |
| [问：shenwenbin0] |
差分输入和单端输入的放大器,在性能上和使用上有何差别? |
| [答：Jan] |
A differential amplifier amplifies the difference between two input
signals. This is also referred to as a differential-input single-ended
output amplifier. Single ended inputs are sensitive to noise errors. The
ground and noise problems can be solved by differential inputs. For
further info pass to Harry. |
[2006-5-30 11:50:29] |
| [问：wangjunhu] |
如何消除D类音频放大器中的回声和尖叫声? |
| [答：Harry] |
This is likely due to RFI/EMI b |
